11 lines
427 B
Python
11 lines
427 B
Python
>>> from itertools import permutations
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>>> pieces = 'KQRrBbNN'
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>>> starts = {''.join(p).upper() for p in permutations(pieces)
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if p.index('B') % 2 != p.index('b') % 2 # Bishop constraint
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and ( p.index('r') < p.index('K') < p.index('R') # King constraint
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or p.index('R') < p.index('K') < p.index('r') ) }
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>>> len(starts)
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960
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>>> starts.pop()
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'QNBRNKRB'
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>>>
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